Stud driver



Feb. 17. 1925.

J. J. BYRNE STUD DRIVER Fild Aug. 24', 1922 Patented F eb. 17, 1925.

UNITED stares PATENT QEHQE.

JOHN J. BYRNE, OF BALTIMORE, MARYLAND, ASSIGNOR TO POOLE ENGINEERING &

MACHINE cor/many, or BALTIMORE,

LAND.

MARYLAND, A CORPORATION 01 MARY- STUD DRIVER.

Application filed August 24; 1922. Serial No. 584,139.

To all whomz't may concern: 7 Be it known that I, JOHN J1 BYRNE, a citizen of the United States; residing at Baltimore, in the State of lifarylanchhave invented certain new'and useful Improvements in Stud Drivers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it .appertains to make and use the same.

My invention relates to stud drivers. Among the objects of my invention are To produce a stud driver capable of rapidly introducing or removing studs from the ends of engine cylinders and other machineparts. i

To produce a stud driver capable of being rapidly changedso that it can be operated on studs of difl'erent diameters. To produce a stud driver and operating means therefor so that coaxial alignment ofthe stud and the means for operating the studdriver will not be required.

To provide means in said driver for readily connecting the stud to thesource 'A of power no matter in which direction said source may be revolving.

To-provide means in said driver for automatically disconnecting the stud from the source of power no matter in which direction said source may be revolving.

These and other objects of my invention will be set forth in the following specification, reference being had to the accompanying drawings, and the means by which said objects are. eifectuated will be definitely pointed out in the claims.

In the drawings a Figure 1 is a central longitudinal section of my improved driver, the operating means therefor being shown in elevation.

Fig. 2 is a view of the driver shown in Fig. 1 looking in the direction of the arrow 2 in said figure. e e

5is a stud which is to be introduced into a machine part and6 is a bushing partially surrounding said stud. The bushing 6 fits snugly in a hole 7 provided in the driver body 8 and is secured therein bymeans of the set screw 9. e Bushings similar to 6 are provided in order to adapt my improved driver to studs of various diameters. If a stud of the same diameter as the hole 7 were to be inserted or removed from a machine part, no bushing would be required. For various sizes of studs smaller in diameter than the diameter of the hole 7 bushings similar to 6 but having holes of suitable sizes similar to the hole 10 would be used. It is necessary that the cylindrical surface ofthehole 10 shall be tangent to the cylindrical surface of the bushing 6 and that the axes of the hole 10 and the eccentric shaft '11 lie in the same plane which preferably passes also through the axis of the driver body 8. The shaft 11 is provided with a handle 12 at the upper end thereof and at the lower end, with a reenforcing section 13 terminating in the cam 13 having the lobes 14 and 15, the former of which is provided with teeth trenchant in a counterlockwise direction and the latter of which is provided with teeth trenchant in a clockwise direction.

The clearance 16 between the lobes is provided for a purpose hereinafter explained. groove 17 is provided in the cam 13 for the reception of the point 18 secured to the free end of the spring 19. The other end of said spring is secured to the body 8. The body 8 is provided with a stud 20 formed integrally therewith and extending into a hole 21 in the arbor 22. The hole 21 is larger in diameter than the stud 20 for a purpose hereinafter explained. V

A pin 23 is secured in the arbor 22 and passes through a hole 24: in the stud 20 which is larger in diameter than the diameter than the diameter of said pin. The arbor 9 22 is provided with a tapered portion 25 for insertion in the spindle of the operating means. The operation of my improved stud driver is as follows t---- The lower end of the stud 5 being intro- 95 duced within a threaded hole of a machine part, the upper end thereof is introduced within the hole 10 of the driver. The operator then moves the handle 12 in a direction to engage the teeth of either the lobe 14 or 100 the lobe 15 with the surface of said stud. He then applies the power to the arbor 22 in the proper direction and the stud 5 is rapidly screwed into place.

If the stud 5 has a right hand thread and is to be inserted, or if it has left hand thread and is to be removed, the operator will move the handle 12 in the direction of the arrow 26, bringing the teeth on the lobe 15 in contact with said stud. He will then apply the power and rotate the body 8 in the direction of the arrow 27, thus screwing the stud inwardly or outwardly as the case may be.

It is to be noted that the edges of the teeth on the lobe 15 are placedat increasing distances from the axis of the shaft 11 as they are more distant angularly from the clearance 16. As aconsequence of this construction, when the power is applied to the body 8, said teeth will seizethe stud 5 more firmly. Similarly, if the stud 5 is provided with a right hand threadand is to be removed, or is provided with a left hand thread and is to be inserted, the operator will move the handle 12 in the direction of the arrow 28, thus bringing the teeth on the lobe '14 in contact with said stud. He will then apply the power and rotate the body 8'in the opposite direction to the arrow 27, thus removing or inserting 'the stud as the-case may be.

The teeth on the lobe 14; are formed as described with reference to the teeth on the lobe 15.

The operator may instantly disengage the teeth on either of the lobes 14' or 15 from contact with the stud by reversing the direction of rotation of the body 8.

The clearance 16 is provided to insure sufficient room for the introduction of the stud 5 within the body 8. The groove 17 and pin 18 are provided to yieldingly hold the handle 12 in the position shown in the drawings.

It is to be noted that the arbor 22 is connected to the body 8 so that the axis of the hole 7 may have a transverse movement with reference-to the axis of the'arbor 22. This freedom of movement is provided to avoid the necessity for co-axi'al alignment of the stud 5 and arbor 22 when said stud is the same diameter'as the hole 7 and to provide the requisite freedom of movement when the stud 5 is of smaller diameter than said hole audits axis is, consequently, not in alignment with the, axis of said hole.

While I have shown one form of construction of my improved stud driver and one form of flexible connection between the arbor-and said'driver, yet it is to be understood that the forms shown are for purposes of" illustration only and in nowise to limit the scope of the invention, for many changes may be made therein without departing from the spirit of my'invention.

I claim-2+ 1. The combination in a stud driver, of a body having a hole for the -'reception of studs of one size, bushings for said hole each having a hole for the reception of studs of another size, said holes in said bushings being eccentric to said bushings, an arbor for driving said body, and a driving connection between said arbor and said body arranged to permit said body to move with reference to said arbor to align the holes in said bushings with said arbor.

2. The combination in a stud driver, of a body having a hole for the reception of studs'of one size, of bushings for said hole each having a hole for the reception of studs of another size, the cylindrical surfaces of the holes in said bushings being tangent to the cylindrical surfaces of said bushings, and means for clamping said studs in fixed relation to said body.

3. The combination in a stud driver, of a body having a hole for the reception of studs of one size, of bushings for said hole each having a hole for the reception of studs of another size, means for clamping said studs in fixed relation to said body, an arbor for driving said body, and a flexible connection between said arbor and body permitting of relative axial movement of said arbor and body.

4. In a stud driver, the combination with a body having a hole for the reception of studs, of a cam having a plurality of convex lobes for clamping said studs, the radius of each of said lobes being relatively long, whereby a maximum area of gripping surface is presented to said studs.

5. In a stud driver, the combination with a body having a hole for the reception of studs, of a cam having a plurality of 'con vex lobes for clamping said studs comprising a clearance space between the lobes of said cam, the radius of each of said lobes being relatively long, whereby a maximum area of gripping surface is presented to said studs.

6. In a stud driver, the combination with a body having a hole for the reception of studs, of a cam having a plurality of convex lobes for clamping said studs and oppositely disposed teeth on said lobes, the radius of each of said lobes being relatively long, whereby a maximum area of gripping surface is presented to said studs.

7. In a stud driver, the combination with a body having a hole for the reception of studs, of a cam having a plurality of convex lobes for clamping said studs, a shaft for said cam and a handle for said shaft. I

8. In a stud driver, the combination with a body having a hole for the reception of studs, of a cam having a plurality of convex lobes for clamping said studs, a shaft for said cam, a handle for said shaft and means for yieldingly holding said shaft.

9. In a stud driver, the combination with a body having a hole for the reception of studs, a shaft revolubly mounted in said body, bushings for said hole, each bushing comprising a hole for the reception of studs having its cylindrical surface tangent to 5 the cylindrical surface of said bushing, means for securing said bushings in the hole in said body with the axes of the holes in said bushings in the plane passing through the axes of said shaft and the hole in said body and a cam on said shaft for securing 10 said studs in fixed relation to said body.

In testimony whereof, I aifix my signaturev JOHN J. BYRNE. 

